Remotely controlled plug-type valve shuts off a high-pressure, high-temperature gas flow in a few milliseconds. The valve is actuated by a commercially available electrically initiated squib of low explosive power. More rapid closure is attainable with squibs containing heavier explosive changes

Majeski, S. J.

English

NASA Technical Reports Server

1*11 Flow' 
Nozzle 
June 1966	 Brief 66-10233 
NASA TECH BRIEF	 G 
NASA Tech Briefs are issued to summarize specific innovations derived from the U. S. space 
program and to encourage their commercial application. Copies are available to the public from 
the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Quick-Closing Valve Is Actuated by Explosive Discharge 
Electric Leads 
The problem: 
To devise a remotely controlled valve that will shut 
off a high-pressure (4600 psi), high-temperature 
(10,000°F) gas flow in a few milliseconds. 
The solution: 
A plug-type valve that is actuated by a commercially 
available electrically initiated squib of low explosive 
power. 
How it's done: 
The valve incorporates a piston that is inserted with 
a light interference lit in a cylindrical bore extending
transversely through the flow nozzle. The piston has a 
radial hole which is concentrically aligned with the 
axis of the nozzle to provide unobstructed flow when 
the valve is in the open position. The squib is mounted 
at a small standoff in a cap above the top of the pis-
ton. When the flow is to be shut off, the squib is initi-
ated from a remote voltage source. The resulting deto-
nation drives the piston down the cylinder until it is 
stopped by the nylon plug. In this closed position, the 
piston provides a tight seal against the gas flow. Time 
for complete closure after initiation of the squib is 6 
to 8 milliseconds.
(continued oterleal) 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19660000232 2020-03-11T17:32:16+00:00Z
Notes: 
1. This valve has been used for quick shutoff opera-
tion only. Valves of this type can also be designed 
for remote reverse actuation by mechanical, hy-
draulic, or explosive means. 
2. More rapid closure is attainable with squibs con-
taining heavier explosive charges. 
3. Inquiries concerning this innovation may be di-
rected to:
Technology Utilization Officer 
Ames Research Center 
Moffett Field, California 94035 
Reference: B66-10233
Patent status: 
No patent action is contemplated by NASA. 
Source: Stanley J. Majeski 
(ARC-55) 
Brief B66-10233
	
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Quick-closing valve is actuated by explosive discharge

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